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xen-devel
Re: [Xen-devel] Why cannot HVM open a file as a floopy disk?
Akio Takebe writes ("Re: [Xen-devel] Why cannot HVM open a file as a floopy
disk?"):
> Thank you very much for your elaborating.
> We usually use /dev/floppy of dom0 as floppy disk of guest.
Right, and the code specifically checks whether the backing object in
dom0 is a block device, and if so treats it unconditionally as raw.
> So a raw format floppy disk is not important.
I'm not sure what you're saying ? I asked:
Does anyone use Xen with non-raw floppy disk images in disk files ?
> The restriction is reasonable, but xend would need to be fixed
> because it hangup.
The error handling is appallingly bad, I'm afraid.
> Also I concern about a emulate ide disk of the raw format.
> Is it also vulnerable?
No, there are no vulnerabilities of this kind in our tree - precisely
because of the refusal of the format-guessing algorithm to return
`raw', which is a change I introduced. The effect is that any attempt
to provide a raw image, in circumstances where the code attempts to
guess the format, fails.
In upstream qemu the default configuration is vulnerable, I think, for
most block devices, but I haven't double-checked the latest code. On
the other hand in general in recent upstream qemu it is always
possible to specify the format, elminating the problem.
Ian.
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